[ALUG] Samba problem

One of the few remaining problems I have with my Fedora 7 replacement of Slackware 11 is that I can't get Samba to work. First I tried setting up Samba with the Fedora GUI and that just produced total invisibility, i.e. windows machines couldn't see anything. Then I copied my Slackware smb.conf file across to the Fedora installation (and restarted NMB and SMB), now my windows machines can 'see' the Samba server - they recognise the machine name - but I still can't connect. It seems like Samba isn't recognising my password. What's the best way to diagnose this? -- Chris Green